The interplay of radiative relaxation, structural disorder, and phonon scattering on the quantum-well absorption is studied at the level of a fully microscopic theory. Treating light field, phonon, and disorder coupling quantum mechanically, the theory accurately describes the quantum-well absorption for different degrees of disorder at different temperatures. The results show that disorder, phonon, and radiative broadening are not simply additive. The 1 s-exciton resonance deviates from the Lorentzian absorption line shape for narrow linewidths even when only homogeneous broadening is included. Good agreement with experimental absorption measurements on an In 0.04Ga0.96As/GaAs quantum-well structure is obtained. It is shown that only a careful evaluation of the comprehensive microscopic model can reliably identify homogeneous and inhomogeneous contributions to the linewidth.
|Original language||English (US)|
|Number of pages||9|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jul 1 2003|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics